40 US gallons in US customary cups

Result

The conversion result is: 40 US gallons is equivalent to 640 US customary cups.[1]

Conversion formula
How to convert 40 US gallons to US customary cups?

We know (by definition) that: 1 usgallon ≈ 16 uscup.

We can set up a proportion to solve for the number of US customary cups.

1 usgallon / 40 usgallon ≈ 16 uscup / x uscup

Now, we cross multiply to solve for our unknown x:

x uscup ≈ (40 usgallon / 1 usgallon) * 16 uscup → x uscup ≈ 640 uscup

Conclusion:

40 usgallon ≈ 640 uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.0015625 times 40 US gallons.

It can also be expressed as: 40 US gallons is equal to 1 / 0.0015625 US customary cups.

Approximation

An approximate numerical result would be: forty US gallons is about six hundred and forty US customary cups, or alternatively, a US customary cup is about zero times forty US gallons.

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.